I need to level out a screed. The high point is in the doorway, it then dips rapidly by 5mm, and goes as low as 10mm below on parts of the floor. Self levelling compound seems to go to 6mm, or if I add sharp sand will go up to 15mm but not feather as well - which I need at the doorway.
Am I missing an approach or is SLC with sand the way to go?